Handstand BASE BLOCKS to practice balance. A pair of blocks on the
ground gives you better control over your balance, and is useful to practice
stance changes, and change of weight from right to left (going up and down the
block )

Use as a base for stacking blocks. Thicker than stacking blocks, these have
an anti-slip rubber under, also useful and comfortable for use as a chin block
for contortion.

It has no sealant so you can just use magnesium on it or seal it
yourself.